2003/12/10 by R. H. T. Wilke, Rudeger H. T. Wilke, Sergey L. Bud’ko +5
Materials Science · Physics and Astronomy · #Iron-based superconductors research #Superconductivity in MgB2 and Alloys #Thermal Expansion and Ionic Conductivity #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevlett.92.217003
arxiv created 2003/12/10 · openalex publication_date 2004/05/27 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/30
The upper critical field, Hc2, of Mg(B_1\ensuremath-xCx)2 has been measured in order to probe the maximum magnetic field range for superconductivity that can be attained by C doping. Carbon doped MgB2 filaments were prepared, and for carbon levels below 4% the transition temperatures are depressed by about 1 K/% C and Hc2(T=0) rises by about 5 T/% C. This means that 3.8% C substitution will depress Tc from 39.2 to 36.2 K and raise Hc2(T=0) from 16.0 to 32.5 T. These rises in Hc2 are accompanied by a rise in resistivity at 40 K from about 0.5 to about 10 \ensuremathμ\ensuremathΩ cm.